36results about How to "Short desorption time" patented technology

The invention discloses a one-step validamycin extraction method from macroporous weak acid absorption resin. The method comprises the following steps: isoelectrofocusing a validamycin fermentation broth, filtering before cooling, adjusting a pH value of filtrate to 7 to 9, cooling to a room temperature, absorbing with the macroporous weak acid absorption resin, and washing with deionized water to be neutral; then, desorbing with 1.0 to 2.0mol / L of ammonia and concentrating collected eluate by decompression until the concentration of validamycin is 10 Baume so as to obtain a validamycin aqueous solution; and absorbing with activated carbine, discoloring and concentrating to 15 Baume to 20 Baume and spraying and drying in vacuum at 40 DEG C to 70 DEG C to obtain validamycin powder which contains about 65 percent of validamycin A. The method has the advantages of short technological flows, great absorption, short desorption time, high extraction yield, little wastewater and waste gas emission and low cost.

The invention discloses an oxygen preparation device. The oxygen preparation device comprises a filtering mechanism, an air compressor, a temperature and humidity adjusting mechanism and an oxygenation mechanism which are sequentially connected via air pipelines, wherein the oxygenation mechanism comprises two parallel molecular sieve columns and a sealing casing; the two molecular sieve columns are arranged in the sealing casing in parallel, and the molecular sieve columns is connected with a desorption pipeline; each molecular sieve column comprises a net cylinder, molecular sieve particlesare stacked in the corresponding net cylinder, a sealing adjusting cylinder is sheathed at the exterior of each net cylinder, and comprises a fixed cylinder part and a movable cylinder part, and eachmovable cylinder part is rotationally connected with the corresponding fixed cylinder part by using the center axis of the sealing adjusting cylinder as the rotation axis; each movable cylinder part is provided with an absorption position and a desorption position in the movement travel, and at least one part of the movable cylinder part is overlapped on the fixed cylinder part to expose the net cylinder at the desorption position. The oxygen preparation device has the advantage that the air contract area is greatly increased in the desorption process, and the air movement path is shortened, so that the desorption time is shortened.

The invention relates to a preparation method of a multi-layer hole active carbon membrane coating solid phase micro-extraction head. According to the technical scheme of the invention, the surface ofa stainless steel wire is covered with a polycarboxymethyl silane precursor of a multi-layer hole structure with a vapor assistance method, and stabilization, carbonization and chlorination reactionis performed to obtain the multi-layer hole active carbon membrane coating solid phase micro-extraction head. The preparation method provided by the invention is simple in process, does not cause environmental pollution and is suitable for large-scale industrial preparation. A multi-layer hole active carbon membrane coating has the characteristics of large specific surface area, high porosity andthe like, so that the extraction head is strong in enrichment capacity, large in extraction quantity, good in thermal stability, rapid in parsing speed and long in service life, has higher precision and accuracy and can rapidly determine the content of volatile organic compounds in air.

The invention discloses a centrifugal type carbon tank desorption device and method for an exhaust gas turbine. By utilizing high-speed tail gas of an engine as power, a clutch and a speed reducer are mounted on a power transmission line; when active carbon adsorption capacity reaches the maximum saturation level, a carbon tank is driven by a transmission shaft to rotate, the adsorbed oil-gas is thrown out by centrifugal force; after oil-liquid is formed, the oil-liquid flows into an oil tank through an oil-liquid reflow pipe; when the carbon tank does not reach the saturation level, the active carbon is desorbed by launching pressure difference between the inner part of an air cylinder and the inner part of a combustion chamber, and the desorbed oil-gas flows into an air inlet pipeline of the engine by an oil-gas backflow pipe; and finally, the oil-gas is introduced into the combustion chamber to be used as fuel. By adopting two ways, the active carbon is desorbed, and energy of the tail gas is recycled; moreover, the desorption time is short, the efficiency is high, the desorption amount can be controlled, and liquid oil materials formed by the oil-gas can be recycled.

The invention discloses a VOCs gas recovery and treatment device and method. The VOCs gas recovery and treatment device comprises air blowers, a circulating fluidized bed TCU device, a heat pump system, a valve, a carbon fiber adsorption tank, a condenser, a buffer tank, a pump and a separation tank; and the circulating fluidized bed TCU device comprises a cyclone separator, a fluidized bed TCU device body, the three air blowers and three heat exchangers. Gas introduced by the air blowers is heated by the heat exchangers and then enters the fluidized bed TCU device body, impurities such as water and organic solvent, namely hexane contained in halogenated butyl colloidal particles are separated out and sent to the cyclone separator, after the colloidal particles in the gas are separated, the VOCs gas enters the heat pump system, the heat pump system cools and dehumidifies the VOCs gas, the cold gas containing water and part of the hexane is sent to the buffer tank from the bottom of theheat pump system, the dehumidified VOCs gas enters the carbon fiber adsorption tank, the VOCs gas is adsorbed by the carbon fiber adsorption tank, after adsorption saturation, the adsorption tank ofthe VOCs gas recovery and treatment device is analyzed, then the analyzed hexane gas is condensed and enters the buffer tank, and the gas which is not condensed returns back to the heat pump system.

The invention relates to a method of generating oxygen. The method comprises the steps of: intermittently guiding a stream of oxygen comprising gas through at least one adsorption chamber (12) being equipped with an oxygen separation adsorbent (16), thereby defining an adsorption mode and a desorption mode of the at least one adsorption chamber (12), and thereby enriching the oxygen comprising gas with respect to oxygen, guiding the enriched oxygen comprising gas to a primary side of a dense membrane (52), heating the dense membrane(52) to a temperature at which it is permeable for oxygen, generating an oxygen flow through the dense membrane (52) to its secondary side, thereby separating the oxygen from the enriched oxygen comprising gas and forming a stream of oxygen. According to the invention, the invention further comprises the step of guiding at least a part of the generated oxygen through the at least one adsorption chamber (12) being in desorption mode. The method according to the invention allows generating oxygen in a high purity, thereby being energy saving, cost saving and being performable in a compact device.

The invention relates to a preparation method of a benzene sensor based on an anodic alumina nanowire. The benzene sensor electrode is coated with the anodic alumina nanowire. The preparation method includes pretreatment, oxidation, surface modification, and sensor preparation. The sensor provided by the invention has the characteristics of low cost, rapid response, short desorption time, good repeatability and high accuracy. Preparation of the sensor has the advantages of simple process, low material consumption, high process repeatability and controllability, and is convenient for batch production.

The invention discloses an extraction method for precious metal attracted to columnar activated carbon. According to the extraction method for the precious metal attracted to the columnar activated carbon, it is determined that the adding quantity of sodium cyanide is 190 Kg per batch, the adding quantity of sodium hydroxide is 200 Kg per batch, and the weight of gold-loaded carbon each batch is 3300 Kg; the flow Q of circulation liquid in the overall desorption process is 5 m<3> / h; electrodeposition is started when the inlet temperature of an electric heater reaches 60 DEG C, and the electrodeposition voltage is direct current 2.7 V; heating is stopped when the inlet temperature reaches 100 DEG C, constant temperature electrodeposition desorption is carried out for 4-5 h, and then heatingis carried out; and after the desorption temperature is heated to 145 DEG C, electrodeposition is continuously carried out for 14 h, wherein the heating and heat preservation state is kept at the first 12 h, heating is carried out at the last 2 h. The desorbing process in each batch is shortened from 36 h to 24 h, the lean carbon gold grade is reduced from 130 g / t to 50 g / t or below, the silver grade is reduced to be lower than 100 g / t, and the desorption rate is 97% or above. By means of the extraction method, the gold and silver desorption rate is improved, the desorption time is shortened,and the production cost is reduced.

The invention discloses a molecular sieve drum and a screening device. The molecular sieve drum comprises a drum body, an incoming pipeline and a discharging pipeline are arranged at two ends of the barrel body respectively, molecular sieve particles are stacked in the drum body, the drum body comprises a net barrel and a closed barrel sleeving the net barrel slidably connected on the same axially, and the closed barrel can be at a screening position and a desorption position on a moving stroke; at the screening position, the closed barrel is hermetically fitted on the outer wall of the net barrel; at the desorption position, the closed barrel and the net barrel are superposed axially by one fifth at most. The whole drum body is exposed at the desorption position, so that desorption area is increased greatly, and desorption time is reduced.

The invention relates to the technical field of energy and power and chemical industry production, and particularly discloses a basic aluminum sulfate regeneration desulfurization process based on retarded oxidation and multi-field synergistic desorption. The process includes: performing desulfurization treatment on dust-bearing raw flue gas through combination of SO3<2-> retarded oxidation and multi-field synergistic desorption, thereby obtaining fly ash and dust-removed raw flue gas; immersing the fly ash in desulfurization rich liquor to prepare aluminum sulfate, and mixing the aluminum sulfate with water, CaCO3 or CaO to obtain basic aluminum sulfate; mixing the basic aluminum sulfate, a oxygen blocking agent, desulfurization rich liquor and desorption lean liquor to obtain a desulfurization mixed liquid; and performance a reaction on the dust-removed raw flue gas and the desulfurization mixed liquid to obtain desulfurization rich liquor and clean flue gas. In the invention, by combination of the characteristics of the desulfurization agent and aiming at the common defects of regeneration desulfurization process, the basic aluminum sulfate having excellent comprehensive performance is selected, so that the desorption effect of the basic aluminum sulfate regeneration desulfurization process is enhanced and the cost of the basic aluminum sulfate desulfurization agent, and meanwhile the technical purpose of economic operation is achieved.

The invention relates to a green and energy-saving method for treating VOCs gas of a synthetic rubber drying unit, and belongs to the technical field of gas treatment in the rubber industry. Tail gasof the synthetic rubber drying unit is conveyed to a first heat exchanger in a pressurized mode, exchanges heat with up-to-standard tail gas and enters a condensed water collecting tank to be subjected to moisture separation after being cooled. The tail gas enters a packed bed of a rotary drum in a supergravity absorber together with absorption liquid through a gas inflow pipe; and under the action of supergravity, the absorption liquid forms a molecular-level film to capture and absorb organic volatile components in the tail gas; after being treated by the supergravity absorber, residual VOCsare adsorbed to form up-to-standard tail gas; at least part of the up-to-standard tail gas is recycled. By coupling absorption and adsorption processes, the up-to-standard emission and recycling of the tail gas can be realized.

The invention relates to an organic waste gas treatment method. The organic waste gas treatment method comprises the following steps: (A1) adjusting intake air volume, feeding organic waste gas to be treated into an adsorption treatment channel, adsorbing the organic waste gas to be treated by using an adsorption unit, and discharging the organic waste gas after the organic waste gas reaches the standard, wherein the maximum value of the intake air volume is as follows: Qmax= m.k1.k2 / (C.t); (A2) switching the adsorption unit to be in a desorption state, and feeding steam into a desorption treatment channel to carry out desorption treatment; (A3) switching the adsorption unit to be in a residual desorption gas circulating state, starting a circulating fan, cooling residual desorption gas so that gas-liquid separation is realized, heating separated gas and then returning the heated separated gas to the adsorption unit for adsorption, and circulating the gas which is not adsorbed in a circulation treatment channel, and feeding the separated liquid into a layering groove; (A4) switching the adsorption unit to be in an adsorption state, and entering the step (A1). The organic waste gas treatment method has the advantages of safety and reliability, circulating cooling and adsorption of residual desorption gas, discharge of tail gas with standard level and the like.

The invention belongs to the field of absorbers and in particular relates to a radial tubular absorber and an absorption and desorption method thereof. The radial tubular absorber comprises an absorber shell, a middle shell layer, an outer flow channel, a central flow channel, a powder collection groove and an absorption pipe, wherein a fluid inlet end and a fluid outlet end are arranged at two ends of the absorber shell respectively; the middle shell layer is arranged in the absorber shell; the cross section of the middle shell layer is annular; two ends of the middle shell layer are communicated with a heat exchange medium pipeline; the outer flow channel is arranged in the absorber shell and is located between the middle shell layer and the absorber shell; the central flow channel is arranged in the middle shell layer; the powder collection groove is formed in one end, facing the fluid inlet end, of the central flow channel; the absorption pipe is arranged in the middle shell layerand the absorption pipe is communicated with the central flow channel and the outer flow channel to form a fluid channel. The absorber can realize the regeneration of absorbents and a regeneration manner combines indirect heating and vacuum desorption.

The invention discloses a normal pressure quick desorption electrolysis method of gold loaded carbon, comprising the following steps: a desorption agent containing 2-5% of sodium hydroxide and 5-10% of an auxiliary desorption agent isopropanol is subjected to heating cycle in an entire process system through pumps; the desorption temperature is 80 DEG C and the pressure is 0.1MPa;the gold loaded carbon is desorbed so that the gold enters eluent in the form of complex ions to obtain pregnant solution; the pregnant solution enters an electrolyzer and undergoes electrochemical reaction in the presence of applied voltage so that the gold is deposited and precipitated at the cathode, thus recycling the gold; electrolyzed desorption solution reaches the desorption temperature of 80 DEG C after a heater supplies energy and then circularly passes through the gold loaded carbon to elute the gold in cycles until the concentration of the gold in the pregnant solution is lower than 1-2g / L, then the desorption electrolysis process is completed; the desorption time is only 8-10h; the desorption solution can be reused and can be replenished with the sodium hydroxide and the auxiliary desorption agent isopropanol each time according to the conditions to ensure the concentration of the desorption solution; after being cycled for multiple times, the desorption solution is recycled or processed by purification devices; the desorption solution contains no cyanide, thereby realizing efficient, environment-friendly and clean production.

The invention discloses a dynamic desorption process for gold-loaded carbon, which comprises the following steps that: the gold-loaded carbon is in a loose suspension state when desorption solution flows by further to form a liquid-solid two-phase circulating fluidized bed; and in the dynamic desorption of the fluidized bed, when gold-loaded carbon particles at the axial central part of a desorption device overturn up and down, the gold-loaded carbon particles constantly move upwards under the action of the driving speed of the desorption solution, flow around and flow downwards along the circumferential wall of the desorption device when the gold-loaded carbon particles flow to the top, namely a highest interface of the fluidized bed due to the action of fluid resistance, are gathered into a central desorption solution inlet through the conical bottom when the gold-loaded carbon particles reach the bottom, flow upwards again to perform another cycle and repeat the process again and again to form the dynamic desorption of circulating fluidization. The process ensures that: the gold-loaded carbon particles perform various processes in a flow state; the whole desorption device is inan isothermal and uniform state compared with the conventional static desorption; and the mass transfer and heat transfer rates between the desorption solution and the carbon particles are large, which all strengthen the desorption chemical reaction process. The dynamic desorption of the gold-loaded carbon is more efficient than the static desorption, and desorption time is shortened.

The invention belongs to the technical field of separation and purification of effective components of plant leaves, and in particular relates to a method for separating and purifying plant leaf anthocyanins with mixed adsorption resins. The present invention mixes non-polar and medium-polar resins according to a certain mass ratio, and adjusts the hydrophobic force of the resin by regulating the content of different polar components in the resin skeleton, thereby weakening the adsorption force of the resin and anthocyanin, and at the same time Without affecting the adsorption capacity of the resin to impurities, a mixed macroporous resin filter body suitable for the separation and purification of plant leaf anthocyanins is finally formed.

The invention discloses a method for detecting mycotoxin pollution in agricultural products. The method comprises the following steps: preparation, extraction, desorption and detection of an adsorbedphase. According to the invention, aluminosilicate and activated carbon are adopted as raw materials, and an adsorbed phase is prepared. Through adoption of a mode of extraction, adsorption and then desorption, the situation that a detection result is deviated due to the fact that the extracted mycotoxin content is low or other impurities of the sample are mixed when the mycotoxin content of an agricultural product sample is detected is reduced; detection precision is improved, in addition, a sample and the adsorbed phase are clamped; compared with the existing operation of directly mixing a sample with an adsorbed phase, the operation is simple; the adsorbed phase can be repeatedly used, the sample can be recovered, the desorption operation is performed by using a desorption apparatus, and the mycotoxin adsorbed on the adsorbed phase is subjected to pressurization desorption by using the evaporation expansion pressure of a desorption liquid, such that the desorption effect is completecompared to the desorption effect of an existing atmospheric pressure heating soaking method, the use amount of the desorption liquid is less, and the subsequent detection precision is indirectly improved.

The invention relates to the technical field of energy, power and chemical production, specifically based on the basic aluminum sulfate regeneration desulfurization method based on the inhibition of oxidation and multi-field synergistic desorption. Desulfurization treatment, dust-containing raw flue gas is processed to obtain fly ash and dust-removed raw flue gas; fly ash is immersed in desulfurization rich liquid to react to obtain aluminum sulfate, and aluminum sulfate is mixed with water, calcium carbonate or calcium oxide to obtain basic sulfuric acid Aluminum, mix basic aluminum sulfate, oxygen inhibitor, desulfurization rich liquid and desorption lean liquid to obtain desulfurization mixed liquid; dedusting raw flue gas reacts with desulfurized mixed liquid to obtain desulfurized rich liquid and clean flue gas. The present invention combines the characteristics of the desulfurizer and aims at the common shortcomings of the regenerative desulfurization method, and selects the basic aluminum sulfate with excellent comprehensive performance as the desulfurizer, which not only improves the desorption performance of the basic aluminum sulfate regenerative desulfurization method, but also reduces the cost of the basic aluminum sulfate desulfurizer , while achieving the technical purpose of economic operation.

The invention relates to the technical field of recovery of byproduct gas of organic compounds, and concretely relates to a method forrefining byproduct hydrogen halide gas in a halogenated hydrocarbon production process. The method comprises the following steps: 1) introducing mixed gas containing hydrogen halide gas generated in the halogenated hydrocarbon production process into an adsorber with an adsorption column in the adsorber being an activated carbon fiber adsorption column, adsorbing organic matters in the mixed gas by the activated carbon fiber adsorption column, and collecting pure hydrogen halide gas discharged from an adsorption outlet; 2) loading a power supply at two ends of the activated carbon fiber adsorption column, electrifying, heating and regenerating the activated carbon fiber adsorption column which adsorbs the organic matters, introducing desorption carrier gas into the adsorber, blowing out desorbed organic gas, and cooling to recover the organic matters; and 3) after complete desorption, cooling the adsorber. By adopting an adsorption-electric heating desorption method, the problems of pollution and corrosion of the adsorber caused by the hydrogen halide meeting water can be avoided, the method is simple and efficient, and the production efficiency is obviously improved.

The invention relates to a heating desorption method of a desorption tube. According to the method, a disposable activated carbon desorption tube is adopted, and the working state of thermal desorption is changed into three steps of preparation, desorption and manual sample introduction from four steps of preparation, desorption, sample introduction and aging. According to the characteristics of aworking sample, an automatic sample introduction function of equipment is abandoned and is changed into manual sample introduction which is more in line with the reality, so that the desorption process is simple, the detection result is accurate, the application range is wide, the desorption time is short, and the working efficiency is greatly improved.

A method for preparing a cermet-based zeolite adsorption material with a corrugated structure of the present invention comprises the following steps: performing pretreatment on the surfaces of at least two groups of metal sheets, placing at least one group of glass fiber paper between adjacent metal sheets to form Sandwich structure: Dip-coat the above sandwich structure in the zeolite slurry as a whole, blow off the excess slurry, then dry it at 120-240°C, and finally bake it at 240-300°C for 2-6h; after the baking is completed , installing the baked sandwich structure in an external frame to obtain a cermet-based zeolite adsorption material with a corrugated structure. The metal sheet of the corrugated structure cermet-based zeolite adsorption material obtained by this method has low heat absorption and high thermal conductivity, which makes the loaded zeolite catalyst heated evenly, resulting in a decrease in its desorption efficiency, and overcomes the poor thermal conductivity of traditional ceramic fiber carriers. , leading to the problem of low desorption efficiency of the zeolite catalyst.

In a method for regenerating an electrically conducting adsorbent laden with organic substances, the adsorbent is heated by passing electric current through the adsorbent while not passing a flushing gas through the adsorbent. Subsequently, the flushing gas is passed through the adsorbent while not heating the adsorbent by passing electric current through the adsorbent so that the adsorbed organic substances are flushed from the adsorbent and the adsorbent is simultaneously cooled by the flushing gas.

The invention relates to a toluene sensor based on an anodic alumina nanowire and a preparation method thereof. The toluene sensor electrode is coated with the anodic alumina nanowire. The preparation method includes pretreatment, oxidation, surface modification, and sensor preparation. The sensor provided by the invention has the characteristics of low cost, rapid response, short desorption time, good repeatability and high accuracy. Preparation of the sensor has the advantages of simple process, low material consumption, high process repeatability and controllability, and is convenient for batch production.

The invention discloses a centrifugal type carbon tank desorption device and method for an exhaust gas turbine. By utilizing high-speed tail gas of an engine as power, a clutch and a speed reducer are mounted on a power transmission line; when active carbon adsorption capacity reaches the maximum saturation level, a carbon tank is driven by a transmission shaft to rotate, the adsorbed oil-gas is thrown out by centrifugal force; after oil-liquid is formed, the oil-liquid flows into an oil tank through an oil-liquid reflow pipe; when the carbon tank does not reach the saturation level, the active carbon is desorbed by launching pressure difference between the inner part of an air cylinder and the inner part of a combustion chamber, and the desorbed oil-gas flows into an air inlet pipeline of the engine by an oil-gas backflow pipe; and finally, the oil-gas is introduced into the combustion chamber to be used as fuel. By adopting two ways, the active carbon is desorbed, and energy of the tail gas is recycled; moreover, the desorption time is short, the efficiency is high, the desorption amount can be controlled, and liquid oil materials formed by the oil-gas can be recycled.

The invention provides chloride ion intercalated LDHs as well as a preparation method and application thereof. The preparation method of the chloride ion intercalated LDHs comprises the following steps: (1), dropwise adding a mixed salt solution of nickel chloride and ferric chloride and a sodium hydroxide solution into a reaction vessel at the same time, controlling the reaction pH value in the dropwise adding process, and continuing to stir after dropwise adding is completed; (2) transferring the mixed solution obtained in the step (1) to a microwave synthesizer, and carrying out aging reaction; and (3) after the reaction is finished, carrying out suction filtration, washing and vacuum drying on the product. According to the method, the chloride ion intercalated ferronickel LDHs (CNF-LDHs) are successfully prepared by adopting a microwave-assisted coprecipitation double-drop method, so that the preparation process of the LDHs is obviously simplified, the preparation time is shortened, and the selective adsorption performance of nitrate is improved.

The invention relates to a method for preparing a graphene layer on the surface of a sensor substrate, comprising the following steps: using copper foil as a substrate, preparing and obtaining a graphene layer by chemical vapor deposition, and forming a supporting film on it; removing excess graphite ene and support film, remove the substrate; place the unsupported film side of the graphene layer on the surface of the sensor substrate, make the two contact and heat treatment so that the graphene layer is combined on the surface of the substrate; remove Described support film, and clean described graphene layer surface; Repeat above-mentioned steps, obtain another graphene layer with support film, and it is placed on the graphene layer on the sensor matrix surface that has been processed through above-mentioned steps; Again The supporting film is removed, and the two layers of graphene are bonded together through vacuum heat treatment. Implementing the method for preparing a graphene layer on the surface of a sensor substrate of the present invention has the following beneficial effects: the sensor has higher sensitivity and can desorb faster.

The invention discloses a method and device for desorption and recycling of titanium peroxide containing thallium. The method comprises the following steps: S1: adding titanium peroxide containing TL(I) into HNO3 solution, stirring and filtering to obtain primary precipitate S2: wash the initial precipitate, then react with concentrated sulfuric acid, and filter again to obtain the clear liquid and precipitate A; S3: mix the clear liquid with hydrogen peroxide, then drip ammonia water drop by drop, and collect the precipitate B; S4 : Precipitate A in S2 and Precipitate B in S3 are carried out multi-stage washing; S5: Precipitate A and Precipitate B are dry stored. Improve the recovery rate of titanium peroxide and enhance the effect of desorption cycle.

The invention discloses a method for detecting mycotoxin contamination in agricultural products, comprising: preparation, extraction, desorption, and detection of an adsorption phase; The method of adsorption and re-desorption reduces the deviation of the detection results due to the low content of the extracted mycotoxin or other impurities mixed in the sample when the mycotoxin content of the agricultural product sample is detected, and improves the detection accuracy. In addition, because the sample and the adsorption phase Compared with the existing operation of directly mixing the sample with the adsorption phase, the adsorption phase can be reused and the sample can be recovered. The desorption device is used for desorption operation, and the pressure of the evaporation and expansion of the desorption liquid is used to desorb the adsorbed on the adsorption phase. The mycotoxin is desorbed under pressure, which makes the desorption effect more complete than the existing atmospheric pressure heating soaking method, and uses less desorption liquid, which indirectly improves the subsequent detection accuracy.

The invention relates to a preparation method of a multi-layer hole active carbon membrane coating solid phase micro-extraction head. According to the technical scheme of the invention, the surface ofa stainless steel wire is covered with a polycarboxymethyl silane precursor of a multi-layer hole structure with a vapor assistance method, and stabilization, carbonization and chlorination reactionis performed to obtain the multi-layer hole active carbon membrane coating solid phase micro-extraction head. The preparation method provided by the invention is simple in process, does not cause environmental pollution and is suitable for large-scale industrial preparation. A multi-layer hole active carbon membrane coating has the characteristics of large specific surface area, high porosity andthe like, so that the extraction head is strong in enrichment capacity, large in extraction quantity, good in thermal stability, rapid in parsing speed and long in service life, has higher precision and accuracy and can rapidly determine the content of volatile organic compounds in air.